thanks my friend , i discover another issue and could be related with that .. but i'm going to replace all the fluid .. PTU , RDU + transmissionSounds like your RDU. Take it to your dealership immediately. There's a TSB on it. They need to replace the fluid and replace the vent hose. There is a bad check valve in the hose, that allows moisture to get into the RDU and contaminate the fluid and its friction properties. If that still doesn't solve the TAC-TAC, they will replace the RDU if its under warranty.
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